Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/54—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with at least one nitrogen and one sulfur as the ring hetero atoms, e.g. sulthiame
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/41—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with two or more ring hetero atoms, at least one of which being nitrogen, e.g. tetrazole
  • A61K31/4245—Oxadiazoles
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/54—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with at least one nitrogen and one sulfur as the ring hetero atoms, e.g. sulthiame
  • A61K31/549—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with at least one nitrogen and one sulfur as the ring hetero atoms, e.g. sulthiame having two or more nitrogen atoms in the same ring, e.g. hydrochlorothiazide
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/63—Compounds containing para-N-benzenesulfonyl-N-groups, e.g. sulfanilamide, p-nitrobenzenesulfonyl hydrazide
  • A61K31/635—Compounds containing para-N-benzenesulfonyl-N-groups, e.g. sulfanilamide, p-nitrobenzenesulfonyl hydrazide having a heterocyclic ring, e.g. sulfadiazine
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K9/00—Medicinal preparations characterised by special physical form
  • A61K9/20—Pills, tablets, discs, rods
  • A61K9/2004—Excipients; Inactive ingredients
  • A61K9/2022—Organic macromolecular compounds
  • A61K9/205—Polysaccharides, e.g. alginate, gums; Cyclodextrin
  • A61K9/2054—Cellulose; Cellulose derivatives, e.g. hydroxypropyl methylcellulose
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P9/00—Drugs for disorders of the cardiovascular system
  • A61P9/12—Antihypertensives

Definitions

• the present invention relates to a novel pharmaceutical composition
• a novel pharmaceutical composition comprising a compound of Formula I (Compound I) or pharmaceutically acceptable salts thereof and one or more diuretics as effective components, wherein said one or more diuretics are selected from thiazide derivatives.
• the invention relates to methods for preparing the pharmaceutical composition comprising Compund I and thiazide derivatives and its use for preventing or treating hypertension in mammals, particularly in humans.
• Hypertension affects about 20% of the adult population in developed countries. In the adult population aged 60 years or older, this percentage increases to about 60% to 70% in general. Hypertension also is associated with an increased risk of other physiological complications including stroke, myocardial infarction, atrial fibrillation, heart failure, peripheral vascular disease and renal impairment. Although a number of anti-hypertensive drugs are available in various pharmacological categories, the efficacy and safety of such drugs can vary from patient to patient, in this regard new treatments are still a desired subject.
• Compound I which has a chemical name as 2-ethoxy-1-((2'-(5-oxo-2,5-dihydro-1,2,4-oxadiazol-3yl)-biphenyl-4-yl)methyl)-1H-benzimidazole-7-carboxylic acid (hereinafter referred as "Compound I”) is a novel angiotensin II receptor antagonist and its chemical structure is shown in the Formula I.
• Angiotensin II receptor antagonists are used in the management of hypertension; they may have a particular role in patients who develop cough with ACE inhibitors. Some are also used in diabetic nephropathy and in the management of heart failure. They act mainly by selective blockade of AT1 receptors thus reducing the pressor effects of angiotension II.
• Known angiotension receptor II antagonists from the prior art are candesartan, eprosartan, irbesartan, losartan, olmesartan, telmisartan and valsartan.
• Diuretics are orally administered in the treatment of oedema and hypertension.
• Well known diuretics are thiazides which are known moderately potent diuretics and exert their diuretic effect by reducing the reabsorbtion of electrolytes from the renal tubules, thereby increasing the excretion of sodium and chloride ions, and consequently of water.
• Hydrochlorothiazide is a thiazide diuretic and its chemical name is 2H-1,2,4-Benzothiadiazine-7-sulfonamide,6-chloro-3,4-dihydro-,1,1-dioxide having the following structure (Formula II).
• Thiazide diuretics are used in the treatment of hypertension, either alone or in combination with other antihypertensives. They are also used to treat oedema associated with heart failure and with renal and hepatic disorders. Thiazide diuretics, particularly hydrochlorothiazide may enhance the effect of other antihypertensives, particularly the first-dose hypotension that occurs with angiotensin II receptor antagonists.
• compositions comprising a specific angiotensin II receptor antagonist, such as Compound I and a diuretic selected from thiazide derivatives such as hydrochlorothiazide remain unknown.
• the main challenges when combining two or more molecules in the same pharmaceutical form are (a) to guarantee the chemico-physical compatibility between the different active ingredients and/or between the active ingredients and the excipients used; and (b) to insure the therapeutical compatibility between the two active ingredients regarding their pharmacokinetic and/or pharmaceutical properties in order that the posology of the combined composition allows to obtain safe and efficient plasma levels of both pharmacological agents; and (c) to insure lower incidence of side effects.
• a pharmaceutical composition containing a specific angiotensin II receptor antagonist, such as Compound I, and one or more diuretics selected from thiazide derivatives such as hydrochlorothiazide exerts excellent anti-hypertensive effects and hence useful as a preventative and/or therapeutic agent for hypertension.
• compositions of Compound I or pharmaceutically acceptable salts thereof and a thiazide diuretic, particularly hydrochlorothiazide for oral administration which has an adequate content uniformity causing a good dispersion upon oral administration and high bioavailability with improved manufacturing processes and stability and a robust final dosage form for their preparation and use thereof.
• the main object of the present invention is to provide new pharmaceutical compositions comprising a specific angiotensin II receptor antagonist such as Azilsartan which has a chemical name as 2-ethoxy-1-((2'-(5-oxo-2,5-dihydro-1,2,4-oxadiazol-3yl)-biphenyl-4-yl)methyl)-1H-benzimidazole-7-carboxylic acid (hereinafter reffered as "Compound I”) and one or more diuretics such as thiazide derivatives as effective components which overcomes the above described problems in prior art and have additive advantages over them.
• a specific angiotensin II receptor antagonist such as Azilsartan which has a chemical name as 2-ethoxy-1-((2'-(5-oxo-2,5-dihydro-1,2,4-oxadiazol-3yl)-biphenyl-4-yl)methyl)-1H-benzimidazole-7-carboxylic acid (hereinafter reffered
• compositions of this invention are suitable for the prevention or treating hypertension in mammals, particularly in humans.
• Another object of the present invention is to obtain adequate content uniformity of dosage forms of Compound I or pharmaceutically acceptable salts thereof and one or more diuretics selected from thiazide derivatives such as hydrochlorothiazide with using adequate excipients.
• Yet another object of the present invention is to provide pharmaceutical compositions of Compound I or pharmaceutically acceptable salts thereof with hydrochlorothiazide which is robust (e.g. adequate hardness, low friability) enough to be processed in high speed tablet pressing machines and shipped in low cost packages.
• a further object of this invention is to provide stable pharmaceutical compositions having high bioavailability throughout the shelf-life.
• Yet another object of the present invention is to provide an improved process which is simple, cost-effective and time saving for preparing the pharmaceutical composition of Compound I or pharmaceutically acceptable salts thereof and one or more thiazide diuretics such as hydrochlorothiazde.
• said thiazide derivatives are selected from the group comprising hydrochlorothiazide, methylclothiazide, benzylhydrochlorothiazide, trichlormethiazide, cyclopenthiazide, polythiazide, ethiazide, cyclothiazide, bendroflumethiazide or hydroflumethiazide or mixtures thereof, preferably the thiazide is hydrochlorothiazide.
• a fixed dose drug combination comprising an angiotensin II receptor antagonist such as Compound I or pharmaceutically acceptable salts thereof and one or more diuretics selected from thiazide derivatives such as hydrochlorothiazde.
• Such combination drug should display an immediate drug release profile combined with adequate stability.
• a fixed dose combination of drugs intended for immediate release can be prepared by either making a powder mixture or a co-granulate of the two active ingredients with the necessary excipients, normally keeping the basic formulation of the corresponding mono-drug preparation and simply adding the second drug component.
• the specific angiotensin II receptor antagonist such as Compound I and diuretics selected from thiazide derivatives such as hydrochlorothiazide exert better therapeutic efficacy by combined administration rather than when used separately.
• combinations of angiotensin II receptor antagonist and diuretics selected from thiazide deriatives such as hydrochlorothiazide are more suitable, in terms of safety or efficacy, than the administration of a single product.
• the selection of excipients therefore has an importance to obtain an adequate content uniformity and robustness.
• at least one disintegrant with one or more pharmaceutically acceptable excipients can be used to obtain adequate content uniformity.
• the disintegrant is selected from the group comprising crospovidone, sodium starch glycolate, croscarmellose sodium, low-substituted hydroxpropyl cellulose, starch derivatives and the like or mixtures thereof; preferably the selected disintegrant is crospovidone and/or sodium starch glycolate.
• crospovidone has physical and chemical properties that make it ideal for constituting the appropriate disintegrant for this invention. Because crospovidone particles have a very different appearance from those of the other disintegrants. Crospovidone particles seem to consist of aggregates of smaller particles that are fused together. This aggregation gives crospovidone a spongy, highly porous appearance and it swells very little, yet takes water into its network quite rapidly. This helps crospovidone to dissolve easily and quickly in a little amount of water and makes its disintegrating rate much faster than other related excipients.
• crospovidone is present in an amount of between 0.1.0 to 30.0 % by weight, preferably in an amount of 1.0 to 20.0 % by weight of the total formulation.
• compositions of angiotensin II receptor agonists with thiazide diuretics mostly have corn starch and mannitol with other common known excipients.
• unmodified starch such as corn starch has poor flow characteristics and tends to increase tablet friability and capping if used in high concentrations.
• solid oral dosage forms such as tablets
• sodium starch glycolate when prepared with sodium starch glycolate have good storage properties. Additionally, the improved flow and lubricity characteristics of sodium starch glycolate can impart further benefit to the formulation in a very cost-effective manner.
• the reason for selection of sodium starch glycolate is mainly because of its high disintegrant properties besides its binding properties during granulation step in manufacturing process. So that we can use its both properties in one step.
• the final dosage form of the pharmaceutical composition of Compound I and hydrochlorothiazide has a content uniformity of less than 2.0% RSD (Relative Standard Deviation), preferably less than 1.0 % RSD.
• the pharmaceutical composition further comprise one or more pharmaceutical acceptable excipients which are selected form the group comprising fillers & diluents, binders, lubricants, glidants, coloring agents, coating agents or mixtures thereof.
• suitable fillers & diluents are selected from the group comprising microcrystalline cellulose, lactose, sucrose, glucose, sorbitol, inorganic salts, dibasic calcium phosphate dihydrate and the like or mixtures thereof; preferably the filler & diluents is microcrystalline cellulose.
• magnesium stearate has some disadvantages despite being a good lubricant and because of this it is used in small quantities during drug manufacturing process.
• Magnesium stearate is practically insoluble in water and because of this hydrophobic characteristic it may retard the dissolution of a drug from a solid dosage form such as tablet or capsule.
• Tablet and especially capsule dissolution is sensitive to both the amount of magnesium stearate in the formulation and the blending time.
• Blending time should be limited. Long blending times can result in the formulation of hydrophobic powder beds that do not disperse easily and overblending can cause compaction problems. Tablet dissolution rate and crushing strength decreased as the time of blending increased; and magnesium stearate may also increase tablet friability. Blending times with magnesium stearate should therefore be carefully controlled.
• sodium stearyl fumarate is found to be extremely effective lubricant and less hydrophobic than magnesium stearate and has a less retardant effect on tablet dissolution than magnesium stearate.
• Sodium stearyl fumarate also doesn't have the over blending problems seen with magnesium stearate.
• the pharmaceutical composition of the present invention is free of magnesium stearate.
• one of the main object of the invention is to develop pharmaceutical compositions having optimal mechanical strength.
• the present invention addresses this need and discloses formulations which have a good mechanical strength. These tablets are robust (e.g., low friability, adequate hardness) enough to be processed in high speed tablet pressing machines and shipped in low cost packages, and at the same time retain good dissolution properties. These pharmaceutical compositions have an adequate bioavailability and stable throughout the shelf-life.
• the pharmaceutical compositions of this invention has better storage stability and results a synergistic effect over mechanical strength such as having a better compressibility with less friability.
• robust tablet formulations are obtained in the final dosage forms, when the weight ratio of microcrystalline cellulose to sodium stearyl fumarate is between 100:1 and 1:100 by weight, preferably when it is between 50:1 and 1:10 by weight, more preferably it is 35:1 and 1:1 by weight of the total formulation; said amount makes it possible to significantly improve compressibility and reduce friability. Higher quantities may have negative mechanichal strength of the formulation and lower quantities may worsen the stability.
• the final tablet dosage forms have a hardness of between 5 to 300 Newton, preferably have a hardness of between 20 to 150 Newton and the friability of the final tablet dosage forms is less than 1%.
• the disintegration time of the final dosage forms are less than 2 minutes.
• compositions of the present invention obtained are stable both to the manufacturing process and during storage, e.g a long-term shelf-life of 24 months or more at ambient temperature and in its original packaging, e.g. sealed aluminium blister packs.
• suitable binders are slected from the group comprising starches such as pregelatinized or modified, cellulose derivatives such as hydroxypropyl methyl cellulose, hydroxypropyl cellulose, carboxy methyl cellulose, methyl cellulose; polyvinylpyrrolidone and the like or mixtures thereof.
• suitable lubricants is selected from the group comprising sodium stearyl fumarate, polyethylene glycol, stearic acid, metal stearates, talc, waxes, boric acid, hydrogenated vegetable oils, sodium chloride benzoate and acetate, sodium or magnesium lauryl sulfate and the like or mixtures thereof; preferably the lubricant is sodium stearyl fumarate.
• suitable glidants are selected from the group comprising colloidal silicon dioxide; silicates such as aluminium, calcium and magnesium; talc and the like or mixtures thereof; preferably the glidant is colloidal silicon dioxide.
• suitable coloring agents are selected from the group comprising ferric oxide (red, yellow, black or mixtures) and Food& Drug Cosmetic Dyes and the like or mixtures thereof.
• suitable coating agents are selected from the group comprising hydroxypropyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, polyethylene glycol, titanium dioxide, polyvinyl acetate phthalate, hydroxyproplyl methylcellulose phthalate, methacrylic acid copolymers and the like or mixtures thereof.
• the pharmaceutical composition of Compound I is present in an amount of between 0.1 to 60.0 % by weight, preferably present in an amount of between 0.1 to 50.0 % by weight of the total composition, and hyrochlorothiazide is present in an amount of 0.1 to 40.0 % by weight of total composition.
• the pharmaceutical composition of Compound I or a pharmaceutically acceptable salt is in the form of medoxomil salt.
• the specific angiotensin II receptor antagonist such as Compound I and diuretics selected from thiazides such as hydrochlorothiazide are simultaneously administered, or separately or sequentially administered as described above.
• the dosage form of the present invention is a solid dosage form such as tablets, capsules, powders, sachets, etc.
• the preferred dosage form is in tablet or capsule form.
• Yet a further object of the present invention is to provide a pharmaceutical composition in the form of a bilayer tablet comprising Compound I or pharmaceutically acceptable salts in one layer and hydrochlorothiazide in second layer.
• the bilayer tablet dosage form may comprise a coating.
• compositions of the present invention may be prepared by conventional technology well known to those skilled in the art such as wet granulation, dry granulation and direct compression and the like.
• the preffered wet granulation process of the present invention for preparing the pharmaceutical composition of Compound I or pharmaceutical acceptable salts thereof and hydrocholorothiazide comprises the following steps;
• Another preffered wet granulation process of the present invention for preparing the pharmaceutical composition of Compound I or pharmaceutical acceptable salts thereof and hydrocholorothiazide comprises the following steps;
• the preffered dry granulation process of the present invention for preparing the pharmaceutical composition of Compound I or pharmaceutical acceptable salts thereof and hydrocholorothiazide comprises the following steps;
• the preferred direct compression process of the present invention for preparing the pharmaceutical composition of Compound I or pharmaceutical acceptable salts thereof and hydrocholorothiazide comprises the following steps;
• compositions of this invention are suitable for preventing or treating hypertension in mammals, particularly in humans.
• this oral pharmaceutical composition has been designed, made up of the following:
• Example 1 The pharmaceutical composition of this present invention (Example 1), was tested for the content uniformity against a reference product which is including mannitol, corn starch and magnesium stearate as some of the excipients instead of sodium starch glycolate, crospovidone, microcrystalline cellulose and sodium stearyl fumarate. The results are shown below in Table 1.
• Reference Product Compound I, Hydrochlorothiazide as active ingredients and mannitol, corn starch, povidone, magnesium stearate and colloidal silicon dioxide as inactive ingredients.
• Example 1 The pharmaceutical composition of this present invention (Example 1), was tested by its dissolution profile in phosphate buffer at pH 7.8 and 37°C using a USP apparatus 2 rotating at 50 RPM against the reference product which is mentioned in Example 4. The results are shown below in Table 2.
• Table 2 Dissolution profile test results (%) Time ( min. )
• Example 1 Compound I content (%)
• Example 1 Hydrochlorothiazide content (%)
• Reference Product Compound I content (%) Reference Product Hydrochlorothiazide content (%) 5 75 80 51 60 10 85 88 72 78 15 90 92 80 83 20 95 95 85 88 30 97 98 92 94 45 99 100 95 96 60 101 101 98 99
• Example 1 The pharmaceutical composition of this present invention (Example 1, 2 and 3), was tested by its disintegration against the reference product which is mentioned in Example 4. The results are shown below in Table 3. Table 3 : Disintegration test results (min.) Example 1 Example 2 Example 3 Reference product Time (min.) 1.50 1.60 1.75 3.50

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• 2010
  • 2010-06-11 TR TR2010/04754A patent/TR201004754A1/xx unknown
• 2011
  • 2011-06-10 PL PL13150074T patent/PL2586424T3/pl unknown
  • 2011-06-10 ES ES13150074.6T patent/ES2522873T3/es active Active
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  • 2011-06-10 ES ES11169599T patent/ES2424469T3/es active Active
  • 2011-06-10 PL PL11169599T patent/PL2394638T3/pl unknown
  • 2011-06-10 EP EP13150074.6A patent/EP2586424B1/de not_active Not-in-force
  • 2011-06-10 DK DK11169599.5T patent/DK2394638T3/da active
  • 2011-06-10 EP EP11169599.5A patent/EP2394638B1/de not_active Not-in-force
  • 2011-06-13 US US13/159,049 patent/US20110305757A1/en not_active Abandoned

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